"All Marketplace sellers must follow our selling guidelines and those who don’t will be subject to action including potential removal of their account," an Amazon spokesman said in a statement. "The products in question are no longer available."

More than 40 million people around the world were victims of modern slavery involving forced labor and forced marriage in 2016, according to a report by the United Nations International Labour Organization and Walk Free Foundation.

"The story of 'Slavery gets sh- done' t-shirts sold on Amazon resonated with a lot of people, and quickly resulted in Amazon pulling them off its site," the organization Anti-Slavery International wrote on Facebook. "Now tell us that public pressure doesn't work! Thank you all for not being OK with slavery - it will change the world!"

This is the latest third-party seller to cause a backlash on Amazon. Shoppers were outraged last year over a sweatshirt made by a company called ArturoBuch that appeared to promote anorexia. The New York fashion brand Uzi also faced criticism last year for its Refugee Dress.